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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
358 lines
12 KiB
C
358 lines
12 KiB
C
/*
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* jdsample.c
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*
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* Modified 2002-2015 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains upsampling routines.
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*
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* Upsampling input data is counted in "row groups". A row group
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* is defined to be (v_samp_factor * DCT_v_scaled_size / min_DCT_v_scaled_size)
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* sample rows of each component. Upsampling will normally produce
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* max_v_samp_factor pixel rows from each row group (but this could vary
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* if the upsampler is applying a scale factor of its own).
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*
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* An excellent reference for image resampling is
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* Digital Image Warping, George Wolberg, 1990.
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* Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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/* Pointer to routine to upsample a single component */
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typedef JMETHOD(void, upsample1_ptr,
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(j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
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/* Private subobject */
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typedef struct {
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struct jpeg_upsampler pub; /* public fields */
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/* Color conversion buffer. When using separate upsampling and color
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* conversion steps, this buffer holds one upsampled row group until it
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* has been color converted and output.
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* Note: we do not allocate any storage for component(s) which are full-size,
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* ie do not need rescaling. The corresponding entry of color_buf[] is
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* simply set to point to the input data array, thereby avoiding copying.
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*/
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JSAMPARRAY color_buf[MAX_COMPONENTS];
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/* Per-component upsampling method pointers */
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upsample1_ptr methods[MAX_COMPONENTS];
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int next_row_out; /* counts rows emitted from color_buf */
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JDIMENSION rows_to_go; /* counts rows remaining in image */
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/* Height of an input row group for each component. */
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int rowgroup_height[MAX_COMPONENTS];
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/* These arrays save pixel expansion factors so that int_expand need not
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* recompute them each time. They are unused for other upsampling methods.
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*/
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UINT8 h_expand[MAX_COMPONENTS];
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UINT8 v_expand[MAX_COMPONENTS];
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} my_upsampler;
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typedef my_upsampler * my_upsample_ptr;
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/*
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* Initialize for an upsampling pass.
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*/
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METHODDEF(void)
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start_pass_upsample (j_decompress_ptr cinfo)
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{
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my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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/* Mark the conversion buffer empty */
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upsample->next_row_out = cinfo->max_v_samp_factor;
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/* Initialize total-height counter for detecting bottom of image */
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upsample->rows_to_go = cinfo->output_height;
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}
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/*
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* Control routine to do upsampling (and color conversion).
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*
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* In this version we upsample each component independently.
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* We upsample one row group into the conversion buffer, then apply
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* color conversion a row at a time.
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*/
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METHODDEF(void)
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sep_upsample (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail)
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{
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my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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int ci;
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jpeg_component_info * compptr;
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JDIMENSION num_rows;
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/* Fill the conversion buffer, if it's empty */
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if (upsample->next_row_out >= cinfo->max_v_samp_factor) {
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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/* Invoke per-component upsample method. Notice we pass a POINTER
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* to color_buf[ci], so that fullsize_upsample can change it.
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*/
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(*upsample->methods[ci]) (cinfo, compptr,
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input_buf[ci] + (*in_row_group_ctr * upsample->rowgroup_height[ci]),
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upsample->color_buf + ci);
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}
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upsample->next_row_out = 0;
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}
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/* Color-convert and emit rows */
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/* How many we have in the buffer: */
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num_rows = (JDIMENSION) (cinfo->max_v_samp_factor - upsample->next_row_out);
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/* Not more than the distance to the end of the image. Need this test
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* in case the image height is not a multiple of max_v_samp_factor:
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*/
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if (num_rows > upsample->rows_to_go)
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num_rows = upsample->rows_to_go;
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/* And not more than what the client can accept: */
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out_rows_avail -= *out_row_ctr;
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if (num_rows > out_rows_avail)
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num_rows = out_rows_avail;
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(*cinfo->cconvert->color_convert) (cinfo, upsample->color_buf,
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(JDIMENSION) upsample->next_row_out,
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output_buf + *out_row_ctr,
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(int) num_rows);
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/* Adjust counts */
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*out_row_ctr += num_rows;
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upsample->rows_to_go -= num_rows;
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upsample->next_row_out += num_rows;
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/* When the buffer is emptied, declare this input row group consumed */
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if (upsample->next_row_out >= cinfo->max_v_samp_factor)
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(*in_row_group_ctr)++;
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}
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/*
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* These are the routines invoked by sep_upsample to upsample pixel values
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* of a single component. One row group is processed per call.
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*/
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/*
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* For full-size components, we just make color_buf[ci] point at the
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* input buffer, and thus avoid copying any data. Note that this is
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* safe only because sep_upsample doesn't declare the input row group
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* "consumed" until we are done color converting and emitting it.
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*/
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METHODDEF(void)
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fullsize_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
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{
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*output_data_ptr = input_data;
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}
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/*
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* This is a no-op version used for "uninteresting" components.
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* These components will not be referenced by color conversion.
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*/
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METHODDEF(void)
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noop_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
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{
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*output_data_ptr = NULL; /* safety check */
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}
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/*
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* This version handles any integral sampling ratios.
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* This is not used for typical JPEG files, so it need not be fast.
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* Nor, for that matter, is it particularly accurate: the algorithm is
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* simple replication of the input pixel onto the corresponding output
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* pixels. The hi-falutin sampling literature refers to this as a
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* "box filter". A box filter tends to introduce visible artifacts,
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* so if you are actually going to use 3:1 or 4:1 sampling ratios
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* you would be well advised to improve this code.
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*/
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METHODDEF(void)
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int_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
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{
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my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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JSAMPARRAY output_data = *output_data_ptr;
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register JSAMPROW inptr, outptr;
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register JSAMPLE invalue;
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register int h;
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JSAMPROW outend;
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int h_expand, v_expand;
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int inrow, outrow;
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h_expand = upsample->h_expand[compptr->component_index];
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v_expand = upsample->v_expand[compptr->component_index];
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inrow = outrow = 0;
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while (outrow < cinfo->max_v_samp_factor) {
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/* Generate one output row with proper horizontal expansion */
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inptr = input_data[inrow];
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outptr = output_data[outrow];
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outend = outptr + cinfo->output_width;
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while (outptr < outend) {
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invalue = *inptr++; /* don't need GETJSAMPLE() here */
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for (h = h_expand; h > 0; h--) {
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*outptr++ = invalue;
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}
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}
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/* Generate any additional output rows by duplicating the first one */
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if (v_expand > 1) {
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jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
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v_expand-1, cinfo->output_width);
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}
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inrow++;
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outrow += v_expand;
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}
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}
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/*
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* Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
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* It's still a box filter.
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*/
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METHODDEF(void)
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h2v1_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
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{
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JSAMPARRAY output_data = *output_data_ptr;
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register JSAMPROW inptr, outptr;
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register JSAMPLE invalue;
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JSAMPROW outend;
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int outrow;
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for (outrow = 0; outrow < cinfo->max_v_samp_factor; outrow++) {
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inptr = input_data[outrow];
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outptr = output_data[outrow];
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outend = outptr + cinfo->output_width;
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while (outptr < outend) {
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invalue = *inptr++; /* don't need GETJSAMPLE() here */
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*outptr++ = invalue;
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*outptr++ = invalue;
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}
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}
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}
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/*
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* Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
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* It's still a box filter.
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*/
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METHODDEF(void)
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h2v2_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
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{
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JSAMPARRAY output_data = *output_data_ptr;
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register JSAMPROW inptr, outptr;
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register JSAMPLE invalue;
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JSAMPROW outend;
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int inrow, outrow;
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inrow = outrow = 0;
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while (outrow < cinfo->max_v_samp_factor) {
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inptr = input_data[inrow];
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outptr = output_data[outrow];
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outend = outptr + cinfo->output_width;
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while (outptr < outend) {
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invalue = *inptr++; /* don't need GETJSAMPLE() here */
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*outptr++ = invalue;
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*outptr++ = invalue;
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}
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jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
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1, cinfo->output_width);
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inrow++;
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outrow += 2;
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}
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}
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/*
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* Module initialization routine for upsampling.
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*/
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GLOBAL(void)
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jinit_upsampler (j_decompress_ptr cinfo)
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{
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my_upsample_ptr upsample;
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int ci;
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jpeg_component_info * compptr;
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int h_in_group, v_in_group, h_out_group, v_out_group;
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upsample = (my_upsample_ptr)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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SIZEOF(my_upsampler));
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cinfo->upsample = &upsample->pub;
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upsample->pub.start_pass = start_pass_upsample;
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upsample->pub.upsample = sep_upsample;
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upsample->pub.need_context_rows = FALSE; /* until we find out differently */
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if (cinfo->CCIR601_sampling) /* this isn't supported */
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ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
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/* Verify we can handle the sampling factors, select per-component methods,
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* and create storage as needed.
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*/
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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/* Compute size of an "input group" after IDCT scaling. This many samples
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* are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
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*/
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h_in_group = (compptr->h_samp_factor * compptr->DCT_h_scaled_size) /
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cinfo->min_DCT_h_scaled_size;
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v_in_group = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
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cinfo->min_DCT_v_scaled_size;
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h_out_group = cinfo->max_h_samp_factor;
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v_out_group = cinfo->max_v_samp_factor;
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upsample->rowgroup_height[ci] = v_in_group; /* save for use later */
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if (! compptr->component_needed) {
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/* Don't bother to upsample an uninteresting component. */
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upsample->methods[ci] = noop_upsample;
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continue; /* don't need to allocate buffer */
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}
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if (h_in_group == h_out_group && v_in_group == v_out_group) {
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/* Fullsize components can be processed without any work. */
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upsample->methods[ci] = fullsize_upsample;
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continue; /* don't need to allocate buffer */
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}
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if (h_in_group * 2 == h_out_group && v_in_group == v_out_group) {
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/* Special case for 2h1v upsampling */
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upsample->methods[ci] = h2v1_upsample;
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} else if (h_in_group * 2 == h_out_group &&
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v_in_group * 2 == v_out_group) {
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/* Special case for 2h2v upsampling */
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upsample->methods[ci] = h2v2_upsample;
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} else if ((h_out_group % h_in_group) == 0 &&
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(v_out_group % v_in_group) == 0) {
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/* Generic integral-factors upsampling method */
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upsample->methods[ci] = int_upsample;
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upsample->h_expand[ci] = (UINT8) (h_out_group / h_in_group);
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upsample->v_expand[ci] = (UINT8) (v_out_group / v_in_group);
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} else
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ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
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upsample->color_buf[ci] = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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(JDIMENSION) jround_up((long) cinfo->output_width,
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(long) cinfo->max_h_samp_factor),
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(JDIMENSION) cinfo->max_v_samp_factor);
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}
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}
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